Luas = 1/2 x D1 x D2
96 = 1/2 x (3x + 1) x 12
96 = 6 x (3x + 1)
96 = 18x + 6
18x = 90
x = 90/18
x = 5
Maka;
Diagonal 1 = 3x + 1 = 3(5) + 1 = 15 + 1 = 16 cm
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Luas = 1/2 x D1 x D2
96 = 1/2 x (3x + 1) x 12
96 = 6 x (3x + 1)
96 = 18x + 6
18x = 90
x = 90/18
x = 5
Maka;
Diagonal 1 = 3x + 1 = 3(5) + 1 = 15 + 1 = 16 cm
d1 = 3x+1 d2 = 12
lbk = d1×d2 /2 = 3x+1×12 /2 = 96
3x+1 ×6 = 96
18x + 6 = 96
18x = 90
x = 5 cm
d1 = 3(5)+1 = 16cm